Grinding-mill



(No Model.) 4 Sheets-Sheet 1. L. D. HARDING.

GRINDING MILL.

No. 450,014. Patented Apr. 7,1891.

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WITNESSES:

(No Model.) 4 Sheets-Sheet; 2. L. D. HARDING.

GRINDING MILL. No. 450,014. Patented Apr. 7,1891.

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(No ModeL)" 4 Sheets-Sheet 3;

L. D. HARDING. GRINDING MILL;

No. 450,014. 4 p Patented Apr. 7, 1891.

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(No Modl.) v I 4 Sheets-Sheet 4 L. D. HARDING.

GRINDING MILL. No. 450,014. Patented Apr. '7, 1891.

ATTORNEYS UNITED STATES P TENT OFFICE.

LEGRAND D. HARDING, OFOOLFAX, WASHINGTON.

GRlNDlNG-MllrL.

SPECIFICATION forming part of Letters Patent No. 450,014, dated April '7, 1891.

Application filed October 4, 1889. Serial No. 326,( )10. (No model.)

To all whom it may concern.-

Be it known that I, LEGRAND D. HARDING, of Colfax, in the county of Whitman and State of Washington, have invented a new and Improved Grinding-Mill, of which the folllowing is a full, clear, and exact description. The object of the invention is to provide a new and improved grinding-mill which is simple and durable in construction, very effective in operation, and especially designed for gradually reducing grain to difierent degrees of fineness and ultimately to flour and feed. The invention consists of certain parts and details and combinations of the same, as will be hereinafter fully described, and then pointed out in the claims. 7

Reference is to be had to the accompanying drawings, forming a part of this specification,

in which similar letters of reference indicate corresponding parts in all the figures.

Figure l is a side elevation of the improvement. Fig. 2 is an end elevation of the same. Fig. 3 is a sectional side elevation of the grinding-rollers and feed-hopper. Fig. 4. is a sectional plan view of the grinding-rollers. Fig. 5 is a sectional plan view of a device for adjusting one of the grinding-rollers. Fig. 6 is a sectional side elevation of the same on the line at w of Fig. 5. Fig. 7 is an enlarged end elevation of an eccentric-shaft. Fig. 8

is a side elevation of one of the hangers for the grinding-rollers. Fig. 9 is a side elevation, partly in section and with the casing moved, of two mills coupled together; and Fig. 10 is a side elevation of the feed-hopper for the same. V

The improved grinding-mill is provided with a hollow base A, carrying a casing B, in which are mounted to turn the grinding-rollers O and D, adapted to be held in frictional contact with the stock passing between them at their peripheries, as is plainly shown in Figs. 3 and 4.. The grinding-roller'is pro: vided in its periphery near the middle with an annular recess 0, into which fits a correspondingly-shaped annular ofiset D, formed on the other grinding-roller D. Instead of forming the recess and olfsets in the grinding: rollers, they may be produced by placing together rollers of diflerent diameters, as shown in Fig. 9. The grinding-roller's-C. and D are fastened on the shafts E andF, re-

suitable bearings in the casing B.

spectively, mounted to turn in suitable bearings E and F, respectively, located on the outside of the casing B and supported on the pointed ends of screws E and F respectively, screwing in the forked ends of the hangers E and F respectively, passing through lugs A, formed on the base A, and supported at their lower ends on screws E and F respectively, screwing in lugs A also formed on the base A directly below the lugs A. The screws E and F when properly adjusted are locked in place by suitable jam-nuts, as shown in Fig. 1. In a similar manner the screws E and F are locked in place by jam-nuts E and F screwing against theunder side of thelu gs A On the hangers E and F are held adj ustably the collars E and F respectively, adapted to abut against theunder sides of the lugs A. By the means just described the hangers E and F canbe conveniently raised and lowered, and the bearings E and F can be adjusted sidewise by the screws F. and F respectively.

The shaft E is the driving-shaft, and is connected with suitable machinery for imparting a rotary motion to said shaft. On one end of the shaft E- is secured a pulley K, over which passes a belt K, also passing over a pulley K secured in one outer end of a shaft L, extending transversely and mounted to turn in The part of the shaftL inside of the casing B is the feed-roll, (see Fig. 3,) above which is held the hopper, N, carrying a shaft N mounted to turn in the sides of the casing B. On one...

outer end of the shaft N is secured a weighted arm N WhlChfSGl'VGS to press the lower edge of the hopper-N toward the shaft L to regulate the amount of material passing from the hopperN overthe feed-roll'L to the grindingrollers C and D. On the shaft N is also secured an arm Niresting on a rod N on which is screwed a thumb-nut N against a coiled spring N Said spring rests on a guideway N through which said rod passes loosely at its lower end, so. that by screwing the thumbnut up or down on the said rod N G the arm Nit-may be raised or lowered at its outer end, and therebythefeed-hopper N may be moved towardonfiiomthe feed-roller L, thereby regulatingthfeed. ,The hangers F support the roller-shaft F, and are made horizontally ad end of the base A.

roller 0 whenever desired. The hanger 1 is.

for this purpose passed through an elongated hole in the lug A, and its lower end is provided with a slot F7, (see Fig. 6,) into which. passes the upper end of the set-screw F thus permitting a sidewise adjustment of the said hanger F and at the same time permitting the screw F to support the said hanger.

The device P for adjusting the hangers F horizontally for the purpose of setting the rolls in grinding position is provided with a collar P, engaging the lower end of each rod P provided on its outer end with a handwheel P for conveniently turning saidscrew. Each screw-rod P screwsin a collar P mounted on the eccentric end Q of a shaft Q, mounted to turn in suitable bearings in one (See Figs. 5 and 6.) Each eccentric end Q of the shaft Q is provided with an aperture sufficiently large to permit the passage of the screw-rods P A jam-nut P screws on each of the screw-rods P against the collar P so as to lock the screw-rod P in place when the adjustment has been made.

On the shaft Q is held a downwardly-extending rod QZ-which, when moved outward, turns the shaft Q and moves the eccentric ends Q, so'as to cause an inward movement of the collars P whereby the screw-rods'P move with the collars and push by the collars P on the hangers F so that the grinding-roller Dis moved out of contact with the grinding-roller G.

On the inside of the casing B, at each side and between the casing and the ends of the rolls, is fastened a padded ring to prevent the dust from rising from the hollow base A.

The casing B is provided with a hinged cover 13', which permits convenient access to the hopper N. The ends ofthe casing B are provided with doors B for examining the feeding device. On the ends of the base A are arranged hinged doors A for examining the ground material as it leaves grindin'g-rollers G and D. On the shaft E on the outside of the casing 13 are held the pulleys G in frictional con tact with the corresponding' pulleys H, en

gaged at their peripheries by the inside of a ring I, preferably made of spring metal or other suitable material, said pulleys H having flanged edges to guide said ring I. Each of the pulleys H is supported on a shaft H,

mounted to turn in the forked end of a screw 1-1 screwing in a nut H ,in which also screws a screw H fulcrumed at H on the base A. By adjusting the nut H by means of its handles 1-1 the pulley H may be moved farther outward or inward, thus pressing with more or less force against the ring I and the pulley G and also against the pulley J, on the inside of each ring 1, directly opposite the pulley H and held loosely on the end of the shaft F, the said pulley J being also provided with flanged edges to guide the said ring I. The ring 1 passes at its upper part between suitable guideways I, secured on the casing, and is in frictional contact with the pulleys H and J. Thus when the shaftE is rotated the pulleys G on the said shaft impart a rotary motion to the pulleys H, and the latter, on account of their frictional contact with the rings I, andiin conjunction with the pulleys'J, rotate said rings.

When the main drive-shaft E is set in motion, the pulley K is rotated, and by means of a belt K imparts a rotary motion to the pulley K by which the feed-shaft and the feedhanger F and in each collar P screws ascrew-' tact with a large roller 0, as the case may be) comes in contact with the small part of the roller D (or with a small roller D, as the case may be) the small part or parts of the rollerD (orthe small roller D, as the case may be) would be rotated by the large parts of the roller 0 or'by a large roller 0 by frictional contact with the moving chop or stock ata peripheral speed very nearly equal to that of the face of the driving-roller C; but as the large part of'the roller D or a large roller D, as the case may be, comes in contact with the stock pass ing between it and the small part of the roller 0 or with a small roller 0, as the case may be,

as is clearly shown in Fig. 11, the motion of the roller D is retarded by its frictional contactwit-h the stock passing between it and th'e'small portion of the roller 0 (or a small roller 0, as the case may be) in such a manner as to cause the said roller D to make the samenumber of revolutions in a given time as is" made by the said roller 0. Thus by coupling together rollers with alternately large and small parts, or by coupling together alternate largeand small rollers, as is clearly shown in Figs. 10 and 11, the peripheries of thesecondary line of rollers are differentially and properly driven by'imparting motion to the primary movers or drivers on the main drive-shaft E and using the stock passing between them and their opposing rolls instead of belting or gearing to drive them with a proper differential at their peripheries.

' The operation is asfollows: When the main driving-shaft E is set in motion, the grindingrollers'Dand O are rotated toward each other, as previously described, and at the same time the feedishaft L is turned, so that the material placed in the hopper N passes to the grinding-rollers O and D past the lower end of the swinging hopper N. The material passing between the grinding-rollers C and D is ground bythe latter, and then falls into the hollow base A, from which it can be trans ferred by any suitable means to a second mill of similar construction and shown in Fig. -9.

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This operation is repeated and the stock sent forward from one set of rollers to another until any required degree of fineness is acquired. Dust arising during the process of grinding settles in the ends of the grindingrollers O and D and passes into the dustspouts R and R, held in the ends of the said grinding-rollers C and D, and each provided with a scraper R nearly in contact with the inside of the respective grinding-roller O or D. (See Figs. 3 and 4..) I v As shown in Fig. 9, any number of such grinding-mills may be arranged in a line or in lines and coupled together, and may be alternately provided with rolls large and small in diameter. The peripheries of the grindingrollers may be provided with separate cylindrical steel faces, either corrugated or smooth, or may be cast with their faces chilled. By thus arranging a number of grinding-mills in a line or in lines and coupled together it is in: tended to produce a reduction-machine for reducing grain, to which power may be applied at one end, preferably by coupling'directly to the motor or power shaft. The parts of large diameter coupled to this shaft may be called the primary movers or drivers and reducers and may be so proportioned in size as to work in conjunction with'the alternately small parts in the same line and theings are relieved from the strain of drive belts or gears, and also'from the strain of belts or gears used to produce the difference in speed. By this arrangement it is evident that there is a great saving of power and that it is much easier to keep the journal-bearings from heating and causing the grinding-faces to get out of parallel, and also that the time usually lost in mending belts, 860., when torn, or laces when broken, or the belts when they become too long or too loose, can be saved.

It is further evident that by the combination of the hollow grinding parts with the openings in the ends of the casings and the spouts R and R fixed therein and the scrapers attached that the hot air will be caused to pass out from the grinding parts and to relieve them and also the journals from the heat caused by grinding, which would otherwise become excessive and overheat the stock and the journals. By this arrangement it is obvious that astill further increase of capacity may be acquired' Having thus fully described my invention,

I claimas new and desire to secure by Letters Patent 1. In a grinding-mill, the combination, with grinding-rollers provided with friction-pulleys on their ends, of screws H pulleys H, mounted in the screws and engaging the pulleys of one of the grinding-rollers, pivoted nuts H .into which the screws H work, and the rings I, engaging the pulleys on one of the grinding-rollers and the pulleys H, substantially as herein shown and described.

2. In a grinding-mill, the combination, with a roller supporting hangers, of the collars P, engaging the lower ends of the hangers, screw-rods P working in said collars, collars P mounted on the eccentric ends Q of the shaft Qand into which the rods P screw, the jam-nuts P on the screw-rods, and the rod Q secured to the shaft Q, substantially as herein shown and described.

3. In a grinding-mill, the combination, with a roller supporting hangers, having their lower ends slotted, and screws engaging the slotted ends of the hangers for adjusting them vertically, of the collars P, engaging the lower ends of the hangers, screw-rods P working in said collars P, the shaft Q, having eccentric ends Q, the collars P mounted on the eccentric ends of the shaft and into which the rods 1? screw, and the rod Q se cured to the shaft Q, substantially as and for the purpose set forth.

4. In a grinding-mill, the combination, with a grinding-roller having an annular recess in its periphery, of a second grinding roller held in frictional contact with the stock passing between it and said first-named grinding-roller and provided on its periphery with an annular offset fitting into the annular recess of the said first-named grinding-roller, and dust-spouts held in bothopen ends of the said grinding-rollers, substantially as shown and described.

5. In a grinding-mill, the combination, with a grinding-roller having an annular recess in its periphery, of a second grinding-roller held in frictional contact with the stock passing between it and said first-named grinding-roller and provided on its periphery with an annular offset fitting into the annular recess of the said first-named grinding-roller, dust-spouts held in both open ends of the said grinding-rollers, and scrapers formed on the said dust-spouts and nearly engaging the inside of the said rollers, substantially as shown and described.

LEGRAND D. HARDING.

Witnesses: p

R. L. MCCROSKEY, J. J. PULSE.

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